content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * -----------------
   * DatasetGroup.java
   * -----------------
   * (C) Copyright 2002-2008, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 07-Oct-2002 : Version 1 (DG);
   * 26-Mar-2003 : Implemented Serializable (DG);
   * 20-Aug-2003 : Implemented Cloneable (DG);
   *
   */
  
  package org.jfree.data.general;
  
  import java.io.Serializable;
  
  /**
   * A class that is used to group datasets (currently not used for any specific
   * purpose).
   */
  public class DatasetGroup implements Cloneable, Serializable {
  
      /** For serialization. */
      private static final long serialVersionUID = -3640642179674185688L;
  
      /** The group id. */
      private String id;
  
      /**
       * Constructs a new group.
       */
      public DatasetGroup() {
          super();
          this.id = "NOID";
      }
  
      /**
       * Creates a new group with the specified id.
       *
       * @param id  the identification for the group.
       */
      public DatasetGroup(String id) {
          if (id == null) {
              throw new IllegalArgumentException("Null 'id' argument.");
          }
          this.id = id;
      }
  
      /**
       * Returns the identification string for this group.
       *
       * @return The identification string.
       */
      public String getID() {
          return this.id;
      }
  
      /**
       * Clones the group.
       *
       * @return A clone.
       *
       * @throws CloneNotSupportedException not by this class.
       */
      @Override
      public Object clone() throws CloneNotSupportedException {
          return super.clone();
      }
  
      /**
       * Tests this instance for equality with an arbitrary object.
       *
       * @param obj  the object (<code>null</code> permitted).
       *
       * @return A boolean.
       */
      @Override
      public boolean equals(Object obj) {
          if (obj == this) {
              return true;
          }
          if (!(obj instanceof DatasetGroup)) {
              return false;
          }
          DatasetGroup that = (DatasetGroup) obj;
          if (!this.id.equals(that.id)) {
              return false;
          }
          return true;
      }
  
  }
  